For full Pelagornis taming details, download the taming calculator app.
The Pelagornis now perfers Pegomastax Kibble on the latest version of Ark, however, this update has not been released on consoles, so Compy Kibble should be used. In addition, the Lymantria's Health and Stamina stats are now updated to match this patch's flyer changes. (Console ETA is April 24.)
You can tame it on primitive plus but you need to make the kibble in a cooking pot. It won't work if you make it in a cauldron. Hopefully that's helpful to those that are trying to make kibble but cannot.
Can easily over encumber itself gathering organic polymer. However, using a quetzal as a carrier of both the animal and the polymer can allow for very successful polymer runs. Sometimes bringing in excess of 1000 in a hour run on an island server.